Will I face entry refusal into Thailand after multiple tourist visa visits this year?

Okay, questions like "would they have any reason to refuse me entry" are not the ones that can be easily answered.

Your entry history (which was NOT on ANY visa btw but on 30 day visa exempt entries) is not such that it shows you living here on back-2-back visa exempt or tourist visa entries.

Now you could catch an immigration officer stamping you in on a bad day and they could ask for proof of 20K baht in cash, proof of onward travel (within the time you're stamped in for) and proof of confirmed lodging BUT that is unlikely.

I would be prepared but you should be fine.

My personal opinion, you wouldn't have any problem.

Of course anyone could be asked for proofs, but your history seem to be far from "living back to back with tourist status".

Just for example, not for all, I know someone who travels Thailand often each time 1-2 weeks this year already 4 or 5 times (similar last year and before for several years) has no problem every time on visa exempt, never worries a bit.

You received a visa exempt entry at the airport, and there should be no problem with you getting another one

Are you talking about the no-cost 30 day visa exemption (which is not a visa)? I've heard there is a limit of 2 of those per year.